Cultivator.



I No. 642,795.

Patented Feb. 6, I900. G. JERNBEBG.

CULTIVATOR.

(Application filed Aug. 81, 1899.)

2 Sheets+-Sheet l.

(No Model.)

No. 642,795. Patented Feb. 6, I900.

G. JERNBERG.

GULTIVATOR.

(Application filed Aug. 31, 1899.) (No Model.) 2 Sheets-$heet 2 NITED STATES PATENT OFFICE.

GUSTAF JERNBERG, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THE EMERSON MANUFACTURING COMPANY, OF SAME PLACE.

CU LTIVATO R.

SPECIFICATION forming part Of Letters Patent NO. 642,795, dated February 6, 1900.

Application filed August 31, 1899- Serial No. 729,073. (No model.)

To whom it mag/concern:

Be it known that I, GUsTAF J ERNBERG, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Cultivators, of which the following is a specification.

The object of this invention is to construct a cultivator in which the drag-bars are counterbalanced by a spring and in which an adjustable auxiliary spring is employed when the shovels are in working position.

In the accompanying drawings, Figure 1 is a plan view of one-half of a cultivator embodying my improvements. Fig. 2 isa lengthwise vertical section; Figs, 3, 4t, and 5 are details of the connection of the shovel with the standard. Fig. 6 is a View of the connection between the slide 33 and support 15.

The main frame of the cultivator consists of the supporting-wheels 1, arched axle 2, tongue 3, bars 4, connecting the tongue and axle, and anevener 5. The bars 4 support a hammock-seat 6.

To the under face of the bar I is secured a bracket 7, having two lengthwise slots 8. A drag-bar 9, supporting shovel-standards 10,

has a pivotal connection with the bracket by its forward end, located in one of the lengthwise slots 8 and held in place in a pivotal manner by a bolt 11. The distance between the drag-bars can be varied by adjusting the drag-bars bodily into the other lengthwise slot of the bracket.

Upon the axle is pivoted a rock-arm 12, and to its upper end is pivoted an arm 13, its lower end having a pivotal connection with the drag-bar 9. A hand hold 14 is secured to the arm.

Between the axle and bar 4 is located a bracket 15, secured in place by a clamp 16. This bracket has a stud 17 upon which is pivoted a brace-rod 18, its upper end being connected to the rock-arm 12 and serving to hold the rock-arm 12 in a position at right angles with the axle.

To the rock-arm 12 is pivoted a yoke 19, having its ends 20 turned outward, and upon the same pivot is pivoted a yoke 21, havinga cross-bar 22.

A bracket 23 is secured to the bar 4:, anda spring 24 has an adjustable connection with the bracket at one end. Its other end has a connection with the yoke 19. A bracket 25 is secured to the under face of the bar 4:, and to its free end is pivoted an arm 26. This bracket has a tubular portion 27, and the arm has a tubular extension 28, pivoted thereto and located within the tubular portion of the bracket. A rod 29 is located within the tu bular extension 28 of the arm. One end of the rod is headed and a pin 30 is passed through the other end of the rod. Acoiled spring 31 surrounds the rod 29 between its head and the tubular extension 28. The rock-arm 12 has an extension 32, which receives the headed end of the rod 29. A bar 33 has notches 3st in its under face and a handhold 35 at one end. The other end is pivotally connected to the upper end of the arm 26. The bracket 15 has a loop 36, within which the bar 33 is located, and the notches 34 engage the lower edge ofthe loop. By means of the bar 33, adjustable in connection with the loop 36, it is movable in its lengthwise direction. This movement imparts a swinging movement to the arm 26, which in turn moves the tubular extension 28 in the tubular portion of the bracket 27, thereby changing the tension of 1 the coiled spring 31. Then the drag-bar is in working position, the extension 32 of the 33 the tension of this spring can be changed so that the drag-bar will enter the ground at a greater or less depth as the spring 24 is used to assist the attendant in raising the drag-bars, and when the drag-bars are raised the arm 13 will come in contact with the crossbar 22 of the yoke 21 and guided in position by the prongs 20 of the yoke, thereby forming a stop to the arm and holding the drag-bar elevated.

The lower end of the shovel-standard is recessed and roughened and adapted to fit a'convex surface secured to the back of the shovel 39. The concave surface is roughened. A bolt 40 connects the parts. By means of the roughened surface in the connection between the standard and shovel the shovel is held from slipping in any position it may be adjusted.

I claim as my invention 1. In a cultivator, the combination of a main frame, a drag-bar, a rock-arm having a pivotal connection with a stationary support, an arm having a pivotal connection with the rock-arm and with the drag-bar, a yoke having a pivotal connection with the rook-arm its ends branching out, a spring connected With the yoke and a stationary support and a stop for the arm supported by the rock-arm.

2. In a cultivator, the combination of a main frame a, drag-bar, a rock-arm having a pivotal connection with a stationary support, an arm having a pivotal connection with the roclearm and with the drag-bar, a brace connecting the rock-arm and having a pivotal connection with the stationary support, and a spring connected with the rock-arm and stationary support.

In a cultivator, the combination of a main frame, a drag-bar, a rock-arm having a connection with the drag-bar and a pivotal connection with a stationary support, a spring connecting the rock-arm and stationary support, the rook-arm having an extension, a

spring adapted to exert its force against the extension, an arm adjusting the tension of the spring and a lever for moving the arm.

5. In a cultivator, the combination of a main frame, a drag-bar, a rock-arm havinga pivotal connection withthe drag-bar and a pivotal connection with a stationary support, a spring connecting the rock-arm and a stationary support, the rock-arm having an extension, a spring adapted to exert its force against the extension, an arm adjusting the tension of. the spring and a lever for moving the arm, the lever having a series of notches in its under face.

GUSTAF JERNBERG.

Witnesses:

A. O. BEHEL, E. BmIEL. 

